Slotting-tool.



I. B. MALABY.

SLOTTING TOOL.

APPLICATION FILED SEPT.25.1914.

Patented J 11110 20, 1916.

Tm: COLUMBIA PLANOORAPH 60., WASHINGTON, n. C.

IRA B. MALABY, or PHILADELPHIA, PENNSYLVANIA.

SLOTTING-TOOL.

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Specification of Letters Patent.

Patented June 20, 1916.

Application filed September 25, 1914. Serial No. 863,556.

To all whom it may concern:

Be it known that I, IRA B. MALABY, a citizen of the United States, residing in Philadelphia, Pennsylvania, have. invented certain Improvements in Slotting-Tools, of which the following is a specification.

In applying wall anchors such asthose illustrated in my application for patent filed of even date herewith for the purpose of connecting various devices to sheet metal structures, it is necessary to provide circular holes having one or more lateral slots or re-' cesses for the reception and support of the lateral projections of said wall anchors, and where such structures are themselves completed and form part of finished buildings,

' which it has been found difficult to make such slots without depressing or otherwise marring said structure, as well as practicably impossible to make the slots of suitable and uni-' form size and shape.

One object of my invention therefore is to provide a conveniently operative, simple and substantial tool whereby one or more lateral slots or recesses may be made in the edges of a hole previously formed in a body of sheet metal, theItool being so constructed that all of such recesses shall be'uniformin size and shape.

Another object of the invention is to provide a tool having: the above noted characteristics which in addition shall be capable of forming slots and supporting tongues adjacent thereto, even in relatively thick bodies of metal and that withoutjin any way depressing or otherwise marring the adjacent portion of the same. 7

These objects and other advantageous ends I secure as hereinafter set forth, reference being had to the accompanying drawings in Figure 1 is a side elevation of a slotting tool constructed according to my invention; Fig. 2 is a vertical section of the tool shown in Fig. 1, taken on the line 6-2,

, and showing the holding member in its contracted position; Fig. 3 is a fragmentary elevation showing the holding member in its extended position; Figs. 4 and 5 are two elevations at right angles to each other illustrating the detail construction ofcertain parts constituting my invention; Fig. 6 is a perspective view of the slotting blade and its attached plunger; Fig. 7 is a fragmentary elevation showing the slotting blade 'in a position at right angles to that of Fig.- 3;

and Fig. 8 is a plan and Fig. 9 is a section on the line a;a Fig. 8, illustrating the work performed by my improved slotting tool.

In the above drawings, 1 represents a cylindrical casing preferably having a large portion of its surface knurled or roughened to facilitate it being held and having one end open while its other end is provided W1th a threaded passage for the reception having relatively narrow neck portions 8,

and each terminating ina semicylindrical extension '9 having a flangelO which forms an annular groove adjacent the extremity of said jaws. Between these jaws is mounted a slotting blade 11 which as shown in Fig. 6 consistsof a substantially rectangular steel plate 12 having its lower corners cut off at an angle of about 45 degrees and connected to a plunger 13 by pins 14. :This plunger fits and is longitudinally movable through the head 6 and at its upper end has fixed to it a head 15, between which and the inner end of said guide is confined a relatively strong coil spring 16.

When the various parts of the device are assembled ready for use the head 15 of the plunger 13 abuts against the upper end of the cavity of the casing 1 and is engaged by the inner end of the screw 2, while the pins or keys 5 lock the head 6 in place within the lower end of the casing. Under these condlt'ionsthe slotting blade 12 is held as far as possible away from the flanged end of the slotted head 6 which is so made that its two aws are normally in engagement with each the diameter of such hole. If now, the tool with its parts in the positions shown in Fig. 2 have its flanged ends passed'through the hole 19 of the sheet metal piece, the screw 2 may be rotated by means of its cross arms 4, while the casing 1 is grasped and tightly held. The screw is thus forced into said casing so that its inner end engages the head of the plunger, thus compress ng the spring 16, and moving said plunger with its slotting blade 12 through the rigidly held head 6.- As said blade 12 moves down wardly the resiliently connected jaws are forcedapart thus causing the extensions 9 of the jaws to move outwardly until their surfaces engage the edges of the hole 19, at whichtime the-flanges 10 project under the said edges and effectually prevent the withdrawal of the tool from the hole. The continued movement of the screw 2 into the casing 1 then forces the blade '12 beyond the end of said casing so that the beveled portion of its lower end cuts into opposite portions of the edge of the hole, forcing tongues 21 of metal downwardly as indicatedin-Figs. 7 and 9. The'adjacent faces of these tongues are inclined at opposite angles to the center line of the hole 19 and provide supports for the laterally projecting wings of the wall anchor, the recesses left by said tongues being designed to receive said wings or projections. Thereafter I a reversal of the movement of the screw 2 causes the spring 16 to draw back the plunger l3 and with it'the slotting blade 12, thus allowing the jaws of the head 6 to spring back into the position shown in Fig. 2 when said blade is fully retracted. When in this position, the flanged end 10 of the holding headmay be withdrawn through the hole 19.

From the above it'will be noted that it is possible to form recesses in the edges of a hole in a relatively heavy body of sheet metal or pther material without in any way depressing the adjacent portions of said metal, since all parts of the-edge of the hole are supported on the flange 10 of the tool'while the tongues 21 are being forced 7 plate to form said recesses.

out of the metal 'Ijclaim-: I 1. The combination in a slotting tool of an expansible flanged member for holding the tool to a body of sheet metal; a slotting member; and means for forcing said latter member into the sheet metal.

' 2. The combination in a slotting tool of amember formed to pass through a hole in a body of sheet metal'and engage the opposite surface thereof to hold'the tool thereto; a slotting member movable substantially axially relatively to the first member; and means for forcibly moving the. slotting member in a line parallel to that of said first member. to cause it to cut into the sheet metal. The combination in a slotting tool of a hooked member formed to pass through a hole in'a body of sheet metal and engage the edge thereof to hold the tool in position; a cutting member mounted with its cutting edge directed toward the hook of the first member; and means for forcibly moving said second member into cutting engagement with the edge of the hole, in opposition to the holding action of said hooked member.

- 4L. The combination in a slotting tool of a holding member expansible laterally thereof; a slotting member; and means for moving said slotting member longitudinally of the tool into cutting engagement with a body of material held by the first member in a plane at right angles to the line of movement of the slotting member.

5. The combination in a slotting tool of a casing; a slotted holding member; a slotting member guided thereby; and means for forcing said slotting member into cutting engagement with a body of sheet metal supported by said holding member in a plane at right angles to its line of movement.

6. The combination in a slotting tool of a casing having an expansible holding head having a plurality of sections; a slotting member mounted between said sections; and means for projecting said slotting member to separate the sections and thereafter act to cut the material engaged thereby.

7. The combination in a slotting tool, of a casing; a plunger mounted therein; a slotting blade carried by said plunger; a head expansible by said blade; and a screw for projecting the blade.

8. The combination in a slotting tool, of a casing having a flanged head made in a plurality of resiliently connected parts; a cutting tool in the casing operative to expand the parts of said head; and means for actuating the cutting tool to expand the head and cut into the material engaged thereby.

9. The combination in a cutting tool, of a casing; a holding head therefor; a plunger in the casing; a cutting member carried by the plunger; means for actuating the plunger to project the cutting member and expand the head; and a spring for retracting said cutting member.

10. The combination in a slotting tool, of a casing; a holding head therein consisting of a plurality of resiliently connected parts; a cutting member mounted between said parts; a plunger for actuating said member; a spring operative between the head of the plunger and the holding head; and a screw operative on the plunger for projecting the same and spreading the parts of the head.

11. The combination of a casing; a holding head therein consisting of a body of metal having slots placed to form relatively resilient jaws; a cutting blade mounted between said jaws; a plunger connected to said blade; and means for actuating the plunger to cause the blade to expand the jaws and thereafter cut into the body of material engaged thereby.

12. The combination in a slotting tool, of a hollow casing; a holding head mounted therein and consisting of a flanged portion projecting beyond the end of the casing, said flanged portion being resiliently connected to the remainder of the head and having a longitudinally extending slot; a plunger; a cutting blade mounted in the slot of the head and connected to the plunger; a spring tending to retain the plunger within the casing; and a screw operative on the plunger to force the cutting blade beyond the end of the casing.

13. The combination in a slotting tool, of a holding head formed in a plurality of resiliently connected parts; a blade operative between said parts and having its corners beveled; means for causing said blade to expand the head and then thereafter cut into the body of material engaged thereby; and means for retracting said blade.

14. The combination in a slotting tool of a holding head having a lateral extension formed to pass through and engage the opposite surface of a body of sheet material; a cutting member; and means for forcing held by the lateral extension of said head.

15. The combination in a slotting tool of a laterally flanged head; a cutter operative adjacent said head; and means for forcing said cutter into the edge of a hole through Which the head extends. In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

IRA B. MALABY. Witnesses:

WILLIAM E. BRADLEY, WM. A. BARR.

Women of thin patent may he obtained for live cents each, by addressing the "Commissioner of Patenta,

said member into the sheet material 

